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Written by Chris Prosser Data Science Engineer, Maker, Bad Sculpter, located in grey Seattle

  1. March 21, 2022

    Yes, I know there is a network monitoring project called Ganglia. That’s not this. Move along now. I’ve dreamed about building this for about 20 years now (see earlier post). It’s a musical/sound sculpture instrument that consists of 10-20 noise makers distributed around a room. Many of them will have the ability to…

  2. March 06, 2022

    I got frustrated trying to figure out the best way to drive some solenoids. I was looking for something foolproof that I didn't need to design myself. I'm trying to build as much as I can with JLCPCB Assembly which limits parts. I settled on the Infineon BTS724G. It's an automotive part that has all the protections you…

  3. March 05, 2022

    I tried to start this project back in 1999/2000 when I was living in San Francisco. It was inspired by a piece I saw in the gallery at Cellspace https://www.foundsf.org/index.php?title=CELLspace. The piece was a fantastic little music box about 4 inches by 6 inches. It was filled with a microcontroller and all sorts of…

  4. December 25, 2020

    I’m curious about firewalls. I have a Protectli FW4B along with a backup edge router ER-X and decided to do some testing. There are a handful of different ideas I wanted to explore. The first had to do with the value of the next-generation firewall capabilities like threat protection. Practically, it doesn’t matter…

  5. December 23, 2020

    I recently switched from pfSense to https://www.ipfire.org and got to learn the hoops needed for PPPoE over a vlan like Centurylink needs. In IPFire this is considered a VDSL connection and isn’t available during the guided setup. But overall it's a pretty easy process. You'll need your PPPoE username and password from…

  6. November 15, 2020

    I have an older Levo Book holder. If you enjoy reading books and value your neck, I highly recommend this product. I get no kickbacks from the company for this, just a very satisfied customer (https://levostore.com/collections/levo-for-books/products/levo-book-holder-floor-stand). I have an older holder and can no…

  7. November 15, 2020

    I take medications. I'm also very sensitive to medications therefore I take them in liquid form so I can get the dosing dialed and just right. But I have a dilemma. They all look very similar, several of them even begin with the same letter, but I take them at different times of day. After a recent incident where I…

  8. November 14, 2020

    I've been struggling with running my radio cables through the wall. For many years I drilled some holes in the frame that held our cat door, but as you can see below, we stopped using the cat door. With the recent bout of horrible wildfire smoke here in Seattle I was forced to remove the cat door and hole up inside and…

  9. October 11, 2020

    I have an MFJ-1788 Mag Loop antenna. I can tune it very easily by using my RSPdx to view the waveform. In the picture attached you'll notice that the antenna is tuned a little bit high for my current frequency. This makes it super easy to tune without worrying about having to put signal out on the antenna. But I kept…

  10. July 24, 2020

    The creativity of 3D printing! raspberry pi camera mount One of the things I love about 3D printing is the creativity of it. I didn’t want to print any supports, so by putting a flat spot on one side I could print it with no cleanup needed.

  11. July 24, 2020

    Needed and adapter to connect my vacuum to my belt sander. Tada.

  12. July 05, 2020

    One the disappointing aspects of doing your own CNC conversion is that you are the manufacturer. Need to know the limits of your machine? Go ahead and start running tests until something breaks. Rinse and repeat.

  13. May 25, 2020

    I recently picked up a Black and Decker Portable AC https://www.amazon.com/Black-Decker-Portable-Conditioner-Display/dp/B01DLPUWG2 and wanted to port over a Blynk project I had created. I couldn't find anything online about what the infrared protocol is for the remote. So here you go:

  14. January 19, 2020

    The performance of my satellite downlink station is nowhere near as good as I would like. I been doing some various troubleshooting measures to try and figure out what is going on. In my previous post, you can see some of my explorations about antenna tuning. In this post I took my first pass at exploring the feedline…

  15. January 18, 2020

    For my satellite ground station I built an antenna from the plans by WA5VJB http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf I originally built a 7 element 70cm antenna. But then added on a two element 2m one. While I had tuned the 70cm antenna, it was tuned a little too low after the second cut to shorten…

  16. January 12, 2020

    I've been using Pi-Hole for a while and it just caused too many problems. Many shopping carts across the web would just fail. I need to run google ad campaigns and you can't get to the admin UI. Therefore I decided to move dns resolving back to my ER-X and instead use cloudflared to resolve DNS queries so CenturyLink…

  17. January 11, 2020

    I’ve been slowly working towards building a satellite uplink and downlink station for years. I have finally reached a point where I finished building the station and have Receive some signals. The performance is rather abysmal, I still have a fair amount of work to do.

  18. January 11, 2020

    Seattle is due for a big earthquake. Our wrench for our water barrel and emergency gas cutoff was always going walkabout. I whipped up this little holder so it has a home to live on the back of our front door.

  19. February 22, 2016

    I was inspired by the post "Why you should stop worrying about deep learning and deepen your understanding of causality instead" to write up some of the resources I've used over the past year as I myself have tried to learn more about causality. The field of Causal Inference has become much more rich and interesting…

  20. March 22, 2014

    Over the years I've generally avoided Excel. Being a programmer, I could just pick up python and write code to do what I needed, I didn't need to hack something together in Excel. But I always ended up back there for the charting. Then I learned R and have even more reason to avoid Excel. Recently I needed to implement…

  21. October 05, 2013

    First off, my apologies to actual Decision Scientists. I have no formal training and just recently learned that the area I'm fascinated by actually has a name. There are a lot of anecdotes out there about how wonderful all the different Lean Startup methodologies are. If you go and read the Amazon book reviews, you'll…

  22. August 28, 2013

    I'm building my first new product in over a decade. I started my career back in 1993 as a black box tester on Media 100. I joined the team just as the first engineering prototypes were coming in from manufacturing, well prior to shipping v1.0. After that I helped create Adobe ImageStyler 1.0 in 1998, and then Adobe…

  23. August 20, 2013

    Back in my original post about my electric bike conversion I mentioned that I had CFS, aka Chronic Fatigue Syndrome. CFS is a poorly defined health condition that in my opinion actually covers a number of very different health conditions. I'm glad I never really accepted it as a diagnosis from the rheumatologist that…

  24. August 17, 2013

    Earlier this year I got involved with using Lean Startup techniques to help with a new business inside of Adobe. As is my normal style, I read a large number of books to help get my head around the techniques and build up a base of knowledge I could use in the future.   As an entrepreneur/intrapreneur you have to be…

  25. January 01, 2013

    Yesterday I had a chance to fly the Cessna 162/Skycatcher. This isn't a review, just some thoughts on the experience. We just had almost 75 days straight of rain in Seattle. My drive to renton looked like: Joy; Despair; Joy; Despair; Joy as I drove through alternating spots of fog and sun. Luckily for me KRNT ended up…

  26. November 25, 2012

    I recently converted my mini-mill to CNC and watching it run full speed with aluminum is a little terrifying. I thought having some machinable wax to play with while I learn would save me a lot of anxiety. After much searching on the interwebs I decided on a roughly 4:1 mixture of paraffin to LDPE. I decided to add…

  27. November 07, 2011

    In preparation for short dark days, I decided to build a stand to mount my sunlamp in a better position. And if you leave in Seattle without a sunlamp, ask your partner (or close friend) what your mood is like in December. I don't notice my slide into being a crankypants, but my wife certainly does. 20 minutes a day…

  28. July 23, 2011

    Hmm, just saw some discussion about a CNC router. I do have those CNC parts kicking around.... http://solsylva.com/cnc/25x25.shtml http://www.machinistblog.com/solsylva-25x25-cnc-router-build/

  29. July 10, 2011

    How do you know someone is a pilot? They tell you. Again, and again, and again... Today I managed to convince a different instructor (Peter Swift) in a different plane (1946 Aeronca Champ) at a different airport (Harvey Field, S43) that I'm highly unlikely to kill myself in a plane. So unlikely, that he hopped out and…

  30. July 09, 2011

    I don't know about the rest of you, but I start a lot of projects that don't reach completion. I've become emotionally attached to the parts that I dragged around with me so I'm loathe to part with them, but I thought I would start documenting them. Back when I lived in San Francisco and had full use of my arms I…

  31. July 08, 2011

    I finally finished my data acquisition for the bike. I used an Arduino with an SD Shield to capture the TTL serial data as output by the Cycle Analyst. I actually took the bike out to run some errands. One of the annoying things is that I'm using the current and speed control on the Cycle Analyst. It uses a PID loop…

  32. July 08, 2011

    I had a great time giving a talk at dorkbot-sea about my build. Lots of great questions. A couple of people asked how the motor is attached to the controller. Here's a close up that shows the torque plate machined out of 1/4" mild steel along with the motor wires with a drip loop.

  33. June 20, 2011

    Instead of writing the blog, I went ahead and actually put together the bicycle. Pictures: http://chrisnart.smugmug.com/Hobbies/ebike/17646403_trW5zv#1345159639_VnHHPt4

  34. May 14, 2011

    After an obscene amount of time reading the forum at: http://endless-sphere.com/forums/viewforum.php?f=20 I went ahead and ordered parts. What do I have enroute? Direct from Ping Battery (Direct from China): A 15Ah, 48V LiFePo (Lithium Iron Phosphate) battery. From ebikes.ca: 9 continental 9x7 wound motor, rim, and…

  35. May 10, 2011

    Ow. The bike has seen better days. It spent much of last winter our in the rain, tucked in the corner of my backyard in some mulch. I spent some time this weekend cleaning the hubs and repacking the front bearings. I also picked up some nice new tires at REI. I got a pair of Michelin City 26x1.85 tires with reflective…

  36. May 08, 2011

    Since I'm doing all the design on this bike, the number of choices is a little overwhelming. To clarify things, I decided to set the mission I'm trying to accomplish. This is a big thing in the private pilot world because everyone wants the big fast plane, but realistically you are better off choosing your mission and…

  37. May 08, 2011

    While I'm writing about the legal stuff first, that's actually the last thing I did. An Electric Assisted Bicycle must: have working pedals * motor of 1000 Watts or less * 20 MPH or less * Can go anywhere a bicycle can go except the sidewalk. No riding on the sidewalk. * Just follow bicycle laws regarding helmets…

  38. May 03, 2011

    Two things conspired in 2010 to finally push me off my bicycle for good. My right hip continues to slide downhill. While I had surgery on it back in 2006, it wasn't enough and the hip is having arthritis again. Bicycling makes it sore, pop funny, and occasionally stabby. Having my heart rate hit 110 or above for more…

  39. May 01, 2011

    I finally finished the lathe conversion. It ended up being a lot more work than I expected as I ran into problems in pretty much every area. The lathe is a 1995 era Jet 9x20 lathe. It originally had an incredibly heavy 3/4 HP single phase motor. The motor was not a drop in replacement. I had to move the motor mount…

  40. February 13, 2011

    Why did I decide that putting a new motor on my lathe was a good idea? I already have many projects in process; things like figuring out why I can no longer use the heat pump register in my bedroom; landscaping the backyard and getting a tree removed; walking 50 minutes a day. But after I finished the little motor…

  41. January 31, 2011

    My fried Josh managed to find himself owning two lathes. After helping him resolve that problem I found myself an owner of a Jet 9x20 lathe. Not having used a lathe in about 10 years I decided to start by working on a skills building project.  After some looking around, I found the EZ Build Engine plans from the folks…